Duct Optical Fiber Cables – GYTA, GYTS, GYFTY Series

■ Duct Optical Fiber Cables – GYTA, GYTS, GYFTY Series for Underground Use 

Outdoor Duct Optical Cables are strands of specially designed fiber optic cable that are ideally suitable for deployment in underground conduits or ducts. This type of cable guarantees total security for optical fibers while providing long-distance, high-speed data transmission. Duct cables are widely used in backbone networks, metropolitan area networks (MANs), and access networks, particularly in situations where underground ducting provides a secure and stable routing.

 

■ Duct Optical Fiber Cable Structure & Design Features 

The rugged optical fiber cables designed for duct installation are composed of several components, including strength members, water-blocking features, armoring (metal or non-metallic), and outer sheath (PE or self-contained). 

These cables' structure guarantees that they will withstand wet, harsh, and extreme weather cuts as well as mechanical stress. 

Common design features include: 

• The design is a loose tube filled with a water-blocking compound 

• Occasional armoring with steel or aluminum tape 

• The Central Strength Member is a CSM made of steel or FRP. 

• Corrugated steel tape or steel wires for enhanced mechanical protection. 

• A black polyethylene (PE) outer sheath for UV (ultraviolet rays) and chemical resistance.

Download Outdoor Optical Fiber Cable PDF

 

■ Typical Cable Types in This Category 

The selection of models used in duct laying is well documented and highlighted in the PDF:

Model	Structure	Strength Member	Armoring	Fiber Count	Sheath Type
GYTA	Loose tube with AL-tape + PE	Central Steel	Aluminum tape	2–288	PE
GYTS	Loose tube with Steel tape + PE	Central Steel	Steel tape	2–288	PE
GYFTY	All-dielectric, no metal parts	FRP	None	2–144	PE
GYFTA	All-dielectric, with AL-tape	FRP	Aluminum tape	2–144	PE
GYFTW	FRP with dual steel wires	FRP	None	2–144	PE
GYXTW	Central loose tube with steel wires	Central FRP	Steel wires	2–12	PE
GYXTS	Central tube with steel tape	Central Steel	Steel tape	2–12	PE

✅ These cables are non-self-supporting, intended for duct laying, and in some cases, can also be installed in aerial lashing scenarios.

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Customize Your Outdoor Optical Fiber Cable

■ How to Choose Different Types of Outdoor Duct Optical Cable

1. Select by Installation Environment

Installation Scenario	Recommended Cable Type	Description
Underground conduit (standard)	GYTA, GYTS, GYFTY	Standard PE-sheathed cables with good mechanical and waterproof performance
High humidity or flooding zones	GYTS, GYXTS, GYTA53	Steel tape armored cables for enhanced moisture resistance
Urban telecom duct systems	GYFTY, GYFTA	Non-metallic construction, resistant to electromagnetic interference
Power-cable shared trenches	GYFTY, GYFTW	All-dielectric cables ideal for electric environments
Short-distance or indoor drops	GYXTW, GYXTS	Small core count, flexible deployment in limited spaces

 

2. Select by Structural Features

Feature Requirement	Suggested Cable Model	Explanation
Metallic armored protection	GYTS, GYTA	Steel/Aluminum armor enhances crush & rodent resistance
All-dielectric (no metal)	GYFTY, GYFTA	Ideal for lightning-prone or EMI-sensitive installations
High fiber count (>144 cores)	GYTA, GYTS	Multi-loose tube designs support large capacity networks
Self-supporting (limited span)	GYFTW, GYXTW	Built-in FRP or steel wire strength members
Cost-sensitive deployments	GYTA, GYFTY	Widely used, high-performance-to-cost ratio

 

3. Select by Fiber Type (ITU-T Standard)

Project Need	Fiber Type	Notes
Standard long-distance transmission	G.652.D	Low loss, widely compatible
Tight bending or dense duct networks	G.657.A1/A2	Bend-insensitive fiber ideal for FTTH and urban ducts
High-capacity metro or access fiber	G.652.D / G.657	Both are backward-compatible and reliable

 

4. Comparison Table of Typical Models

Model	Armored	Metallic	Self-supporting	Fiber Count	Recommended Use
GYTA	Al-tape	✅	❌	2–288	Underground ducts, backbone
GYTS	Steel	✅	❌	2–288	Damp underground areas
GYFTY	None	❌	❌	2–144	City ducts, EMI-sensitive zones
GYFTA	Al-tape	❌	❌	2–144	Power co-location environments
GYFTW	None	❌	✅	2–144	Short spans, duct + aerial use
GYXTW	Steel	✅	✅	2–12	Outdoor drop, last-mile fiber
GYXTS	Steel	✅	❌	2–12	Local duct drops

Buyer Tips

• Ducts with pull-rope inside: Use non-self-supporting models like GYTA or GYTS 

• Electric interference concerns: Choose non-metallic models like GYFTY or GYFTA 

• Rodent-prone or high-risk areas: Choose steel tape armored cables like GYTS 

• High-volume splicing required: Consider ribbon fiber versions (e.g., GYDTA) for faster fusion

■ Application Scenarios 

• The outdoor duct fiber cables are perfect for: 

• Long-run telecommunication trunk lines 

• Metropolitan backbone connections 

• Access networks linking centers and exchanges 

• Underground cable duct or subway 

• Fiber optic cables (FTTH) installations

■ Fiber & Tube Color Coding

Fiber color coding follows TIA/EIA-598 or YD/T standards, using the standard 12-color sequence (Blue, Orange, Green, Brown, Grey, White, Red, Black, Yellow, Violet, Pink, Aqua). Tubes are coded similarly. Additional fiber counts repeat the color sequence with color ring marks.

Fiber Color Standard Sequence

No.	1	2	3	4	5	6
Color	Blue	Orange	Green	Brown	Gray	White(Natural)
No.	7	8	9	10	11	12
Color	Red	Black	Yellow	Violet	Pink	Aqua

Note:

1. If there are less than 12 fibers in a loose tube, the color sequence is followed continuously, starting from No.1,
2. In the standard color sequence, No.6 white color can be replaced by natural color, called the W color sequence.
3. Color arrangement can be customized.

Tube Color Standard Sequence

No.	1	2	3	4	5	6
Color	Blue	Orange	Green	Brown	Gray	White(Natural)
No.	7	8	9	10	11	12
Color	Red	Black	Yellow	Violet	Pink	Aqua

 

 

■ Cable Marking and Packing

Each cable length is supplied on robust wooden drums, wrapped with a plastic sheet and sealed with battens. Typical marking includes:

• Manufacturer Logo & Fiber Type (e.g., G.652D) 

• Fiber Count & Cable Type (e.g., GYTA 96C) 

• Meter Marking every 1m 

• Drum marking includes origin, project ID, and contract details 

Standard drum lengths range from 2000–4000 meters, with at least 96% usable cable length per drum.

■ Need a Reliable Supplier of Outdoor Optical Cables?

Zion Communication offers: 

✔ Large selection of outdoor fiber cable categories. 

✔ A/B (OEM/ODM) branding into the problem you need. 

✔ Compatibility with ITU-T, IEC, and TIA/EIA standards. 

✔ Cost-effective and rapid delivery. 

Contact us now to get datasheets, samples, and a project-based quote.